package com.aphrodite.io.sdp;

import com.aphrodite.util.StringParser;

/**
 * SDP connection field.
 * <p>
 * <BLOCKQUOTE>
 * 
 * <PRE>
 *    connection-field = &quot;c=&quot; nettype SP addrtype SP connection-address CRLF
 *                       ;a connection field must be present
 *                       ;in every media description or at the
 *                       ;session-level
 * </PRE>
 * 
 * </BLOCKQUOTE>
 */
public final class ConnectionField extends SdpField {
	/** Creates a new ConnectionField. */
	public ConnectionField(SdpField sf) {
		super(sf);
	}

	/** Creates a new ConnectionField. */
	public ConnectionField(String connection_field) {
		super('c', connection_field);
	}

	/** Creates a new ConnectionField. */
	public ConnectionField(String address_type, String address) {
		super('c', "IN " + address_type + " " + address);
	}

	/** Creates a new ConnectionField. */
	public ConnectionField(String address_type, String address, int ttl, int num) {
		super('c', null);
		value = "IN " + address_type + " " + address;
		if (ttl > 0)
			value += "/" + ttl;
		if (num > 0)
			value += "/" + num;
	}

	/** Gets the connection address. */
	public String getAddress() {
		String address = (new StringParser(value)).skipString().skipString().getString();
		int i = address.indexOf("/");
		if (i < 0)
			return address;
		else
			return address.substring(0, i);
	}

	/** Gets the connection address. */
	public String getAddressType() {
		String type = (new StringParser(value)).skipString().getString();
		return type;
	}

	/** Gets the number of addresses. */
	public int getNum() {
		String address = (new StringParser(value)).skipString().skipString().getString();
		int i = address.indexOf("/");
		if (i < 0)
			return 0;
		int j = address.indexOf("/", i);
		if (j < 0)
			return 0;
		return Integer.parseInt(address.substring(j));
	}

	/** Gets the TTL. */
	public int getTTL() {
		String address = (new StringParser(value)).skipString().skipString().getString();
		int i = address.indexOf("/");
		if (i < 0)
			return 0;
		int j = address.indexOf("/", i);
		if (j < 0)
			return Integer.parseInt(address.substring(i));
		else
			return Integer.parseInt(address.substring(i, j));
	}

}
